linux-ext4 - Re: [PATCH V12 16/20] block: enable multipage bvecs

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Date:   Tue, 27 Nov 2018 10:25:19 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Theodore Ts'o <tytso@....edu>, Omar Sandoval <osandov@...com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Dave Chinner <dchinner@...hat.com>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, Shaohua Li <shli@...nel.org>,
        linux-raid@...r.kernel.org, David Sterba <dsterba@...e.com>,
        linux-btrfs@...r.kernel.org,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        linux-xfs@...r.kernel.org, Gao Xiang <gaoxiang25@...wei.com>,
        linux-ext4@...r.kernel.org, Coly Li <colyli@...e.de>,
        linux-bcache@...r.kernel.org, Boaz Harrosh <ooo@...ctrozaur.com>,
        Bob Peterson <rpeterso@...hat.com>, cluster-devel@...hat.com
Subject: Re: [PATCH V12 16/20] block: enable multipage bvecs

On Mon, Nov 26, 2018 at 01:58:42PM +0100, Christoph Hellwig wrote:
> > +		phys_addr_t vec_end_addr = page_to_phys(bv->bv_page) +
> > +			bv->bv_offset + bv->bv_len;
> 
> The name is a little confusing, as the real end addr would be -1.  Maybe
> throw the -1 in here, and adjust for it in the contigous check below?

Yeah, it makes sense.

thanks,
Ming